Saw-filing machine.



W. T. NELSON.

SAW FILING MACHINE.

APPLICATION FILED AUG. 17, 1909.

Patented D60. 9, 1913.

a SHEETSSHEET 1.

COLUMBIA PLANDGRAPH co. WASHINGTON. D. c.

W. T. NELSON.

SAW FILING MACHINE.

APPLICATION FILED AUG.17, 1909.

1,080,921 Pate nted Dec. 9, 1913.

3 SHEETS-SHEET 2.

W. T. NELSON.

SAW FILING MACHINE.

APPLICATION FILED AUG. 17, 1909.

Patented Dec. 9, 1913.

8 SHEETS-SHEET 3.

Y? 1' 1 Fa I g Q /0 7 COLUMBIA PLANOGRAPH C0,, WASHINGTON. 0. c

rrrcn.

SAW-FILING MACHINE.

To all whom it may concern Be it known that 1, 'WILLIAM T. NELSON, acitizen of the United States, residing at Dayton, in the county ofMontgomery and State of Ohio, have invented certain new and usefulImprovements in Saw-Filing Machines, of which the following is aspecifica- 01011.

My invention relates to saw filing machines and is adapted to file theteeth of hand-saws, jig-saws, band-saws, or saws of types other thancircular saws in which the teeth are arranged in substantially astraight line.

The object of the invention is to simplify the structure as well as themeans and mode of operation of such devices whereby they will not onlybe cheapened in construction but will be rendered more efficient andpositive in operation, easily operated and unlikely to get out ofrepair.

A further object is to provide improved mechanism whereby the devicewill be under the control of the operator and whereby it may be adjustedto different angles, thereby giving the cutting face of the saw teethgreater or less degree of inclination.

Further objects are to provide improved means for lifting the file fromengagement with the saw during its retrograde movement and also toprovide improved means for advancing the saw during the return movementof the file.

With the above primary and other incidental objects in view as will morefully appear in the specification, the invention consists of thefeatures of construction, the parts and combinations thereof, and theirmode of operation, or their equivalents as hereinafter more fullydescribed and set forth in the claims.

Referring to the drawings, Figure 1 is a plan view of the assembledmachine. Fig. 2 is a side elevation thereof viewed in the direction asindicated by the arrow in Fig. 1. Fig. 3 is a rear elevation in whichthe swinging frame is shown in a position substantially at right anglesto the base member. Fig. 4 is a detail perspective view of one end ofthe base member showing the adjustable and sliding connections of thesaw-carriage. Fig. 5 is a detail perspective view of the ad justablefulcrum connection of the operating lever for the step by stepmechanism. Fig. 6 is a detail perspective view of the file carryingmember. Fig. 7 is a detail view of the actuating cam of the filecarrying Specification of Letters Patent.

Application filed August 17, 1909.

Patented Dec. 9, 1913.

Serial No. 513,317.

member showing the same in its operated position.

Like parts are indicated by similar characters of reference throughoutthe several views.

In constructing the device there is employed a main base member 1adjacent to the opposite ends of which are carried adjustable uprightsor standards :2. The uprights 2 may be attached to the base 1 in anysuitable manner but are preferably provided with lateral arms 3 therebyforming an L-shaped member, the arm 3 of which projects through a keeper1 secured on the base 1 and is adapted to be clamped therein in itsadjusted position by a set screw or thumb-nut 5. The upper portions ofthe standards 2 are slotted as at 6 in which is adj ustably carried alongitudinal supporting bar 7 upon which is mounted the saw-carriage.The supporting bar 7 may be adjusted vertically within the limits of theslots 6 and is secured in its adjusted position by set screws orthumb-nuts 8. The supporting bar 7 is preferably either rabbeted orformed with beveled edges as at 9 to receive the gibbed supports 10 ofthe saw-carriage. The saw-carriage comprises two longitudinal parallelclamping bars 11 between which the saw to be filed is impinged by meansof clamping screws or thumb-nuts 12. The clamping bars 11 are slidinglymounted upon the longitudinal supporting bar 7 by means of the gibbedsupports 10 to which one of the clamping bars 11 is attached. To providesufiicient resistance to hold the sawcarriage in its adjusted positionon the supporting bar 7 there is provided on each of the gibbed supports10 a spring member 13 bearing upon the surface of the supporting bar 7the tension of which is adjustable by means of screws passing throughthe spring member 13 and engaging the gibbed support 10. Attached to theopposite side of the clamping bars 11 are pockets 15 in which is carrieda longitudinal serrated rod or rack 16, the serrations of which are inthe form of ratchet teeth. Slidingly mounted upon the serrate-d rod 16is a head 17 on which is carried a spring actuated pawl 18 engaging theserrations of the rod 16. Pivotally supported on a bracket 19 projectingfrom the base 1 is an oscillating lever 20 connected by a link 21 withthe sliding head 17. By the oscillation of the lever 20 the sliding head17 will be reciprocated upon the serrated rod 16, the pawl 18 being heldin engagement with the serrations of the rod 16 by the spring 22. As thesliding head 17 is recip-' rocated in one direction, to the left in Fig.3, the pawl 13 engaging the serrations of the rod 16 will advance thesaw-carriage in unison with the movement of the head 17, but upon thereturn movement of the head 17 the pawl will ride freely over theserrations of the rod 16, the saw-carriage remaining at rest, and willengage the rod preparatory toadvancing it an additional step at the nextoperation.

Pivotally connected to the base 1 at the point 23 is a swinging framecomprising two horizontal members 24 and 25 and the ver tical member 26.The horizontal member 25 is extended beyond the member 26 and formedinto the handle 27 by which the swinging frame may be moved about itspivotal connection 23. To support the swinging frame and secure it inits adjusted position, the lower end of the vertical member 26 isbifurcated and engages a curved member 28 supported on the base 1. Athumb-nut or set screw 29 provides means whereby the frame may besecured in its adjusted position. Supported on the hori zontal member 24is a swinging frame comprising the pivoted arms 30 connected at theirextremities bya slotted bar 31. Mounted on the bar 31 and adapted toreciprocate thereon within the limits of the slot 32 is a reciprocatinghead 33 which comprises the tile carrying member and is provided withfile clamping devices 34 which may be of any approved design. The file35 is securely clamped by means of the devices 34 and moves in unisonwith the reciprocating head 33. Suitably journaled on the vertical member 26 of the swinging frame is a drive shaft 36 carrying a crank or asshown in the drawings a disk 37 having thereon a wrist-pin connected bya pitman rod 38 with the reciprocating file carrying head 33. It isobvio-us that upon rotation of the drive shaft 36 the head 33 will bereciprooated upon the bar 31 and the file 35 moved across the sawclamped in the saw-carriage. There is also pivotally connected to thearms 30 a reciprocating bar 39 having a head 40 adapted to be engaged bya cam 41 carried on the drive shaft 36 adjacent to the inner side of thedisk 37. The cam 41 if desired, may directly engage the head 40 of thereciprocating rod 39. However, to insure more even move ment of theparts a swinging arm 42 is pivoted upon the horizontal member 24 and isinterposed between the cam 41 and the head 40 of the bar 39. Uponrotation of the shaft 36 the cam 41 is adaptedto engage the swinging arm42 which in turn engages the head 40 of the reciprocating bar 39 andforces said bar in a horizontal direction which causes a swingingmovement of the pivoted arms 30 thereby elevating the slotted bar 31 andthe reciprocating head 33 above their normal or working position asshown in dotted lines in Fig. 2. This movement of the bar 39 andswinging arms 30 is against the tension of a spring 43 by which theparts are returned to normal position when the cam 41 has been rotatedsufliciently to disengage it from the swinging arm 42 and head 40. Thecam 41 is so located upon the drive shaft 36 in relation to theconnection of the pitman 38 and disk 37 that during the forward movementof the reciprocatinghead 33 the parts will be in their lowermost ornormal position as shown by solid lines in Fig. 2, but, as the head 33approaches the limit of its forward stroke the cam 41 will reciprocatethe bar 39 thereby oscillating the arm 30 and elevating the head 33 andfile carrier thereby and will hold the parts in their elevated positionas shown by dotted lines, Fig. 2, during the retrograde movement of thereciprocating head 33. As the head 33 approaches the limit of itsrearward movement the cam 41 will disengage the bar 39 and permit thereturn of the parts to normal position by means of the spring 43, themovement of said parts being limited by a stop arm 44 secured to themember 24 the surface of which is preferably cushioned by means ofrubber or similar means. During the retrograde movement of the filewhile in its elevated position, the saw-carriage will be advanced apredetermined distance, equivalent to two teeth of the saw beingoperated upon. This is accomplished by means of the step by stepmechanism before described, including the pawl 18 engaging the serratedrod 16. These parts are operated from the main shaft 36 by means of aneccentric 45 connected at 46 to an operating lever 47 which in turn isconnected by a universal joint to the point 48 with the oscillatinglever 20 of the step by step mechanism. Inasmuch as saws vary in regardto the number of teeth per inch means must be provided for varying thestep by step movement to correspond with the particular saw beingoperated upon whereby the advance step will be equivalent to two teeth.It is to be understood that the inclination of the cutting face ofsuccessive teeth of a saw is in opposite directions. For this reason,the swinging frame will beset at the proper inclination with the sawcarriage and each alternate tooth operated upon in the same directionafter which the swinging frame will be readjusted to the oppositeinclination and'the intermediate teeth filed. Thus, at each operation itis necessary to advance the saw the distance of two teeth. To vary thestep by step movementthere is provided an adjustable fulcrum for theoperating lever 47 which comprises a standard 49 adjustably secured uponthe frame member 25 by means of a thumb-nut 50 whereby the standard 49may reciprocate upon the member 25. Pivotally secured to the standard 49is a fulcrum block 51 through which the lever 47 extends. Theconstruction is such that when the standard 49 is shifted upon the framemember 25 the fulcrum block 51 will slide upon the lever 47 therebyvarying the relative proportions of the two arms of said lever 47 andgiving to the working end of the lever a greater or less stroke wherebythe oscillating lever 20 of the step by step mechanism will beoscillated to a greater or less degree thereby shifting the sliding head17 throughout a greater or less movement and moving the saw-carriage acorresponding distance.

In lieu of the shifting fulcrum for the lever 47 as described, differentserrated rods 16 may be employed each rod having serrations therein ofdifferent length and corresponding to the extent of two teeth of the sawwith which it is to be used in which case the serrated rod, havingproper serrations, would be substituted each time it was desired tooperate upon a saw of difierent character.

From the above description it will be apparent that there is thusproduced a ma chine of the character described, possessing theparticular features of advantage before enumerated as desirable butwhich obviously is susceptible of modification within the scope of theappended claims in its form, proportion, detail construction, andarrangement of parts, without departing from the principle involved, orsacrificing any of its advantages.

Having thus described my invention I claim:

1. In a machine of the character described, a base, a saw carriagemovably mounted on said base, means for automatically advancing thecarriage through a step by step movement comprising a reciprocatinghead, a pawl carried by said head, a rack bar carried by the carriageand engaged by the pawl, a swinging frame pivotally supported on saidbase and adjustable to different degrees of inclination therewith, areciprocatory file carried on said frame and adapted to engage the sawin an angular direction according to the adjustment of said frame,swinging arms on which the file is supported, means to oscillate thearms to lift the file during its retrograde movement and means carriedupon the swinging frame to reciprocate the pawl carrying head during theretrograde movement of the tile regardless of the angular adjustment ofthe swinging frame, substantially as specified.

2.111 a saw filing machine, a two part &

main frame the parts of which are adjustable to diiferent angularpositlons in relation with each other, a saw carriage adjustably mountedon one of the frame members, a rack bar connected with said carriage, areciprocating head, a pawl carried thereby and engaging the rack bar,actuating means carried by the other portion of the two part frameadapted to cause the reciprocation of said head in all positions ofrelative angular adjustment of the frame parts, substantially asspecified.

3. In a saw filing machine, a two part frame, the parts of which areadjustable to difierent angular positions in relation to each other, sawcarriage adjustably mounted on one of the frame parts, means to advancethe carriage through a step by step movement including a rack bar, areciprocating head and pawl carried thereby engaging the rack bar, apivoted actuating lever carried on the portion of the frame with thecarriage and adapted by its oscillation to actuate the reciprocatinghead, a second actuating lever carried upon the other portion of the twopart frame and engaging the first mentioned lever, whereby theoscillatory movement of the second mentioned lever will be transmittedto the first mentioned lever, a reciprocatory file, and means tooscillate the second lever during the retrograde movement of the file,substantially as specified.

4. In a machine of the character de scribed, a base, a longitudinalsupporting bar carried on the base, a movable saw carriage, gibbedsupports on the carriage engaging the supporting bar, spring memberscarried by the carriage and engaging the bar to afford resistance to theadvance movement of the carriage.

5. In a machine of the character described, a base, a movable sawcarriage, a reciprocating file, parallel pivoted swinging arms, asupporting bar carried thereby on which the file is reciprocated, meansto move the arms about their pivotal points at predetermined points inthe sequence of operation of the machine comprising a longitudinalreciprocating bar pivotally connected to both the swinging arms movingin unison with and in parallel relation to the supporting bar, and a cammember adapted to reciprocate said bar whereby the file will be elevatedout of contact with the saw during its retrograde movement.

In testimony whereof, I have hereunto set my hand this 3rd day of AugustA. D. 1909.

WILLIAM T. NELSON.

Witnesses:

LAURA B. NELsoN, F. L. WALKER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

